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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9a25c0243c694b7a7ad4dcaf35bca6084925d5787457156fdfe1d97c9fb4ba' 
  AND token = 'TGUNjd591WieHRswmD5n2TWhKZdIlWkZI7Ko/zcPnL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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