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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e22d76c096ef128897f39976552bc5f471be66b09a634de04236ddba8edc7dd' 
  AND token = 'VWH60BmXppX2mPDrYYy8FFViNbUEP8UQ1E5kg8Egu/A=' 
  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"
    }
  }
}