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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c013d349b10c600ebd357bf20cd5876b9082f013afbc37a7e155e00e69cf0f5a' 
  AND token = 'mOL5z2nK7NxeECz+TKUJFcAgwLjyHAh3oGfixLZOjSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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