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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd0fab100e02756f13a487212ce7b12663823a297303ba9e8532c41d13ee4b0' 
  AND token = 'nAm3fB2QUKpPt4ucF/MuloebQuwEIQXq6lGOIRrLBIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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