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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36c672677ed037f48bd6d2b00f30e7273650675f5a936f8309fc7b38a37bcb4' 
  AND token = '7b7T2IZJvCjyXTEDM23J6FNYiUPXnZO1nV120TuBz3Q=' 
  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"
    }
  }
}