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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230ac57a0a18eb254f5e64051b8a5df9b9fdc91c2b1d55bedb865dde0f7c45f7' 
  AND token = 'zu37ZwYvM6rgMFtYsFb4cuz5yqvXX/R7ozXLvq+cQaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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