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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efa2acac7499f01d123922fa93db1e79f4671e9cf8dad601d0f400d69d5a4c6' 
  AND token = 'wNI5U3RTPLzXDqxYA3A7FSM9pWQQNwr90F5Y9hRGf5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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