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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0de37bf8a4ac0b9cd7961135087b10137c9f07d4f85111ae3046ed644a6e6df' 
  AND token = '9yq5NGsXl0nmLmuuOlkkivZfJmQdasgjxCssMGXQv58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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