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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a248c3290bfd8aca4c9c76f8fe4fc59cbdcd238b6c0f2bfe4ba50d499d05d591' 
  AND token = 'b1k1AnAQee545WiSRjN94Diz6Wjaj4E4KV3bdDgdjf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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