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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913d62ba6f7e3e1237d0746aff22a5ae78c9d7292a7a5a146cd4ac6b66f08e54' 
  AND token = 'd4xMLI/sa+4W0R28Zqx/orIUrTY9h/OavxLwR2TCCTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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