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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a3a8bb061a6a6d189923b4e072a623020f9fa035804a58227a113b85b22059' 
  AND token = 'oT5XiX2MvnLwFm4ux4ftrsQ0r9Re5dyG+kALNf/vHVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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