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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf69d69640e0b43e9e5013d2206866254d6918e5c2ceb6c98922902d7536527e' 
  AND token = '4QocjMrNC/IW3FtPphMfHmMCsLhvWz/RLfZ3EAfC0ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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