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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da6ab74ba0d67189e809b198417ae0cf6fdac529f6421c638570f5adb99509d' 
  AND token = 'XxOezPmjQkVtiK8nMPfjUGBD8egxXD7K50beChbC5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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