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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566d805e2463d2936d2fc676ad537f4f4dc4b1720ea592ec9223e4e6b40c4ac8' 
  AND token = 'FRxPpQB6GN9axV0UeGNK25fOwxmNp2peSA3VQv1MVw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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