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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70499e0ec3d62fa1f2b34062f7f2345ae5e7936e3a093636e801bce6539ebea' 
  AND token = 'rWgIKNnDGajOzJ5uW3Je1h5/YtbZIh6iP/HuawqikEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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