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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3ebb28b37639bd6727be6d6611252d15bd74e837e6fd16c5644f6124dd6596' 
  AND token = 'wKnj7DyUT9hgljkf4QgD9gfK0hwhj7Mzqk94z/j5Hlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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