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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ed564156770fa24bb68561546cc399de20eddd165bea8e10be68df3171a87d' 
  AND token = 'zJMqD/2wv1eTpT9IxH11JUwojbEFzYYpFR+ZZfF+m2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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