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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e8bd2fcc3a4765f378aaf91f2e29c85885aa7b0a3d59ff97a05c869892265e' 
  AND token = 'WeNmbA71WQQH2GGWm7c1ntpieXwjtiB4a+wog8HcZtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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