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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30a08d0f7b0a63dcc25852dabaf8695023e7b08c77ca50318208f5937531a5d' 
  AND token = 'KaCtRp1tkTVydcMgXXfpM3HmBqaP9F0/cJHI5aF5s5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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