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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795c090d47dc3e12ab14c198d193386df7b1be38d81e94db629b8e99246dd76d' 
  AND token = 'NhV5JQKEzYJLXa+Cr5eWN0Vpt4VsdsW+lYV5yEYvs0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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