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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb026fbb2015b6fb2fd0d529c9ca03289f2ea4cf31353c2802c5c88f2c91289' 
  AND token = 'BTLiM5HKhOEnFcjNN3xdwKfTywuV0swDcO9go6EMghI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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