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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0103d6fdd7069e3e90580a960388e7cae6a0cbb3ace8b877ae9827b6b998d7' 
  AND token = 'Iq8C6ZVjY0IGuhoa8hRXkuiq8XTCUCMS2n3soR318JM=' 
  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"
    }
  }
}