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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f5a4cba889f370974cfed89777991983f6d51b3a3d77bb1673dafb6c87d879' 
  AND token = 'h479DuhO641gSvW03RHCCd+V6ogLcA+o8Q0eObDBozU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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