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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd81497a3f388be623e4662f551cbac4dc7de16ecdd3fc6f997127b690d8302' 
  AND token = 'PkCRg422KDvEU4zKrHZFbB3yFFizd4CGO+va7SgiIUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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