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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf5a91ae6624c008d85bfa0fb00b8f1d445eb9df7d75928f500d5c85f68feab' 
  AND token = 'dOn7k/6hxby9R3C7NW/ptXwabkNww0IPhuLZai7jMjE=' 
  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"
    }
  }
}