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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9aa4c52d6893263d5b4d5187862a66014ecdd38a2faa543ede51efe42470a3' 
  AND token = 'ShQHDiY490nh9JVjbFiJFTQeXY9H/A4JsCnnPgQo/FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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