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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fa74164b64b08c322939494873945ce6a75c8b81669c4900ff3d411ff4c058' 
  AND token = 'kM5gWY9H8ifQrEU2mDEZS0qysiQ3IwtCQvvl/NbQyB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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