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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8622cd9fc671e261c24fc68d1c3cd2bc555eb61ec1fbd7060d2487f27682d537' 
  AND token = 'ZiPpVkd3gk/WAZ9e7VqLXsMTVd/YPrEhaK+KXK+cMzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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