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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a95ce8e3abd080289c3c058daffaa30eba1fe73d6fad988da614dac6376035' 
  AND token = 'dT4TWL6AUhIn/MQoqivi7vjiyqS0PiJa3l/j1zFAU98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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