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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fdad9388ee963cab9a4f5d0deb1e6311237c923da8e841fdf216302078aefb' 
  AND token = 'wCG5vRIHrxgU+b42YaKcKbox4WMy+SaXBY8A1LCcImo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}