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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a511945dd0de35dbd81fd18ca7096ec74a2cfc74708ab9671dd5aeaacbf2bdd1' 
  AND token = 'Rh4FhPaNU4561ydikh50PhJcVknC8dOaruqO7oo0dcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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