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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b58d66d7d5985e8545157d5f25019484bf84a94ba07e831b8e8df903300f50a' 
  AND token = '9kY8XQYXamYBj/luL6UUaF0jvAJwK5vpbV8cd0OkEoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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