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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec62d55a05c29486f836f24fbf99676ffe8be6743f6c7f5f035811a80d619d7' 
  AND token = 'fZwqAaRV/1soD8/p6NeydDd2osRRFiQ0mLCNT3goT4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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