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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04de86856fe8cbdb142c9bb8291a8a34ed9e2971c4984d37c3c9325be5867cc0' 
  AND token = 'Ire8aFlNMAPilYP6mLh2REkEsYaGHXPiOO1o+RQCOxE=' 
  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"
    }
  }
}