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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80326ff7236e07f50536c9bd4d35fb284a7ebc12b12243981a845572219511b3' 
  AND token = 'yrltMGzV3D6cufeEU4QAHt0PF7pIcwdWbSWDMNHRO2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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