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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead077a9c6aa7ff53313a8f9c1d25b79133ea16e95f569863828a7613e1a92e1' 
  AND token = 'CO7lO+pSD1WeZ3iqOHk/4q5ZPa5/fXIW8oW6WNbuN3I=' 
  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"
    }
  }
}