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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a644ed3a01590aae758866c1d535a1b60ebe364c79a429d1967f083a7be8d1' 
  AND token = 'I0BG7OB5LseEyAsI2Q+7fTshNmPeFG6yqWyTDtDr8Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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