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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaadbdc17a29f28ab899c6fbea5b2a72cff368c4a003e97c8ffab067d8eebf78' 
  AND token = '/eaVjhUGxD/XR4e2i6cWn3PdOfwbv2lGeHeS+55zMRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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