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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfb76cf4f9c644cbcb35a3af19614089697823a3f5548a63f7a96c30f299714' 
  AND token = 'PpXlfaJVb/VQxPmImiG2m/LmsyDGL4yU+33NOLkGzwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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