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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14c61ef36565ac956db55e16640f904ac47700b3b04d401f0607d3dda98a97d' 
  AND token = '43R8bDyZ7n+Qfu15aw8E32arswUiv9F5ls3Kuj5L+r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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