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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11593394c8da22c1950d3ba74f149dba1e9f19c90161de62e1b7d85d19ee64a6' 
  AND token = 'DG26lKO6JSyqesBdxOoLg/X8iv7gf/4mQkpQ6mdjJcY=' 
  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"
    }
  }
}