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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafc50f1fb0c3f397e43f4fe6a30614488c1c42c87f465a051c34d49edb7138a' 
  AND token = 'gLMR4N3IijlrJcACnjppE78cwlckz0+bvPGOTC9J6lc=' 
  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"
    }
  }
}