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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae0679504e72643f3a47e190222e388232f933b36581a27b17dd61dd69d25ee' 
  AND token = 'C8e+26Qk1HKqBgQEcW5f5phXCp9URF5LzVnlbIsT4UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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