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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b533cd2f5482a61e554eee20739d08e1e29b285bceee95c02acb2dea3bc4b92' 
  AND token = 'UgpdynWntYYzQSpZl8JD7W9o01jodgwrw7HnbLNf4TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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