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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd99be8d59d2a0f014b7227b4538bb06ddc1a28a584bdce09b647b19b8ba4cb' 
  AND token = 'pP+cV4cy1IWvLnz2p2Eg+GFw45I/PLK97OB/lZfIw/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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