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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97af2c0c38a4eeb7a5bc77df0a51bbe53844d15e0d9d53fad7e44bcc1893265f' 
  AND token = 'tRgupjq4CaQ5LblQe8r7BIfvvfudds5yqta5/9Br3bI=' 
  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"
    }
  }
}