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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28239bed071412e7c8eb55b59f996707de21136bd4337607b3a7b2cbd9abf1a' 
  AND token = 'lWQuJLArakEE/enGUlGWzpsp8L5A+iFsQeDZPFa7RCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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