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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b6705a4ffcd5913bd39eb815236d5f9b92d2a4408f2a6cfbc3b7383c48ead9' 
  AND token = '6IXxwffDhuwUi7icivLXbV48x4NUJo9i8Fhn/kkQuHg=' 
  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"
    }
  }
}