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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982a1628b9ecbef191eb9204d7e0c69ef67ed747c8e6ef58d14a9b1a3a4d12fb' 
  AND token = 'PXgQ0EtVU5B4jlt1ga2Mr1NwEHbS5GmezuDS4ygE/TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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