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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b508389e1ffbfc2ac8400db6d24309c9db3921f773a88467dc9d968eaede92' 
  AND token = 'x9veW6U7g2Mwxsb1Po+7ZUN+kvozwLKjEo0wuqZ+wYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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