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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a7e1655e588082f3f7a8cc539a59bb3357ef073a05e2c610a509fcb7b9562d' 
  AND token = 'oPWNXBWRH33QCj1Qriz3WmtkWwMkPs8AtFYjt0Retwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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