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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092b9dde1047ba6adf0493cc3a6f0e9efc650d43a03dc908dd20f7b7589cb024' 
  AND token = 'qcKWhzGa78tZcgKHSSqQgsHp3GCLbOmcmCPNMFdBoyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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