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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773ea9f3c6ce4af8f2f2ee339a6d6ce4b041e2939e4524af871bf11b46b93f01' 
  AND token = 'SUZKl8cN27f6MDkDz977kbh2BduGXz2QkSCSAdb9RJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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