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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ceb4a4c789d6840699eea434017901ac65787357c1b9b2eb7928e32224edc2' 
  AND token = 'pi3h9kBVIqH9aata9ts4bVYl+mRB+Q1HVwNXyL3BjLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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