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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '500c2e1feabe08c654647e48057e7d12e27fa6ab0286d98e4405d8413b9cb818' 
  AND token = 'usXHjt/bmSy7MdXi9WJhsmyLhUCa+lkshWa7cND5b5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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