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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0922ce9e0aed2f5c8a6746fe589ea37f505d121f3b2baf889d5fc0737e1747f8' 
  AND token = 'SZKLC5pQHVIANIk8jttsJ/y2kF7PG/eEiWC+5kbotUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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