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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ed1a4b3842cf62c9e2821e227569dc30f2d47c62e5673ff39d0dce40c53969' 
  AND token = 'WJdRYptzqm2KuerEVwPR7Hf4O92mEYIxQP9RtKlVJs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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