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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fda769157f70d46e169826c2b092d4ce412965f03602662dece236455eb94b' 
  AND token = '4W5RpW0u0Ub8n5EINbZmoE/audDMzzgJSYm67HeYUDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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